-35.12% is the change from 521 to 338
Calculation steps:
[( 338 - 521 ) ÷ 521] x 100 = -35.12%
Formula
Percentage change = [(338 - 521) / 521] x 100
Subtract the new number by the original number
338 - 521 = -183
-183 ÷ 521 = -0.3512476007677543
-0.3512476007677543 x 100 = -35.12%